Burglar-alarm



(No Model.)

J. H. LUEBSEN.

BURGLAR ALARM.

No. 315,641. Patented Apr. 14,.1885.

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UNITED STATES PATENT rrics.

JOHN H. LUEBSEN, OF ST. LOUIS, MISSOURI.

BURGLAR-ALARM.

SPECIFICATION forming part of Letters Patent No. 315,641, dated April 14, 1885.

Application filed May 1, 1884. (No model.)

To ail whom it may concern.-

Be it known that I, JOHN H. Lunnsnu, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Burglar-Alarms, of which the following is a full, clear, and exact descrip tion, reference being had to the accompanying drawings, forming part of this specification.

My alarm is arranged to be wound up by the closing of a door,window, or other article to which it may be connected, and to sound an alarm when the same is again opened.

My improvement consists in the construction hereinafter described, and pointed out in the claims.

Figure l is a front view of the alarm connected to a door, the door being closed. The front of the case is removed to show the works. Fig. 2 is a vertical section at 2 2, Fig. 1. Fig. 3 is a horizontal section at 3 3, Fig. 1, showing the door partly open. Fig. at is a transverse section of a trunk or box with my alarm applied thereto.

a is the door-post to which the alarm is attached.

b is a door, to which the cord 0 is connected.

0 is the winding-cord, the same being coiled upon a barrel or drum, (1, upon ashaft with a ratchet-wheel, 6, fast upon it, so that the drum (1 and ratchet-wheel e turn with the shaft, which latter is marked f. This is the springshaft,and to it is attached one end ofthe spring which is coiled upon the shaft and has its other end attached to the housing or frame 71.

t" is a cogwheel turning loosely upon the spring-shaft and having a spring-pawl, j, engaging the ratchet-wheel e. The ratchet-wheel and pawl are so arranged that when the cord 0 is drawn out to wind up the spring 9 the shaft turns in the cog-wheel 1 without causing the rotation of the wheel, while when the spring is uncoiling the shaft, ratchet-wheel, and cogwheel alltu rn together and by suitable cog-gear cause the rotation of the scape-wheel k.

l is the pallet, whose shaft m carries the hammer-rod n and an arm, 0, having an eye,o, at the free end through which the cord 0 passes. The cord may pass through either side, bottom, or top of the case p, and in any case the arm 0 is curved and extended around within the case, so as to bring the eye into the proper position for the cord 0 to pass through it. The cord-drum is surrounded by a casing, r, se' cured to the housing and having an orifice for the passage of the cord, the orilicc being'made on either side, according to the position of the alarm mechanism relatively to the poiutof attachment of the end of the cord 0.

s is the alarm-bell, which is rung by the 0scillation of the hammer a on rod n.

tis a hook on the door I), to which the end of the cord 0 is attached, the arrangement being such that when the door is closed the cord 0 is drawn out and the spring 9 wound up, and when the door is opened the cord is made slack, so that the alarm runs down.

hen the alarm is applied to a trunk, or in any position where the moving part closes toward the alarm mechanism-as the lid b of a trunkthe cord 0 may be attached to one end of a lever fulcrumed to the inner side of the end of the trunk a to which the alarm mechanism is attached. The lever is so arranged that the lid closes down upon its free end t, and by drawing up the other end, i, draws with it the cord 0 and winds up the mechanism. Then when the trunlelid is raised the cord 0 is made slack and the alarm is sounded. The lever forms a prop for the lid when open.

It is obvious that the alarm may be attached to the moving part b, and the end of the cord be attached to the fixed part a, and that the operation would then be the same as before described. The lever would be attached to the same part as the alarm. hen the cord 0 is stretched it prevents the oscillation of the arm 0, and consequently keeps the pallet at rest, whereas the loosening of the cord allows the vibration of the arm 0.

Instead of making the arm 0 with an eye at the end, it may be made of a double wire with a return bend, at the end, against which the cord 0 bears when stretched to cause the arm to act as a detent.

I claim as my invention- 1. The combination of the mainshaft f, drum d, ratchet-wheel a, spring cog-wheel 1', springpawl j, scape-wheel It, cog-gear, shaft provided with pallet t, hammer-rod at, and vibrating arm 0, having eye 0, and a winding and releasing cord 0, connected to thedruin through IOU the eye of the arm andadapted to bear on the pull of the spring by the pressure of the movarm to keep the pallet at rest, as set forth. ingpart on the-opposite end of the lever.

2. The combination with an alarm havin a T cord to wind it up to set the alarm and a spri ng JOHN LUEBSEI 5 t0 sound.v the alarm and wind up the cord when Witnesses: 1

the latter is released, of the lever hinged to a SAML. KNIGHT,

fixed part and holding the cord againstthe GEO. H. KNIGHT. 

